Malicious PDF — malware analysis report

Static analysis result for SHA-256 a820efd8c37cb04f…

MALICIOUS

PDF

45.6 KB Created: 2021-05-17 15:13:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 83fe76ac905771df41b63f7e0d1dd692 SHA-1: 9159d6203e67bda50b0b8c229fb458de97a128c5 SHA-256: a820efd8c37cb04f8bde78ac17dc2cf6b026e3cbc8a3b42c508c082d7d701661
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that lead to known malicious redirectors and scam pages, specifically targeting users interested in game hacks and free in-game currency. The document body and heuristic firings confirm the lure is for game-related cheats and generators. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/how-to-get-free-skins-on-coin-master-game-hack In PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-pe_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/hack-a-game_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47AE 26268 bytes
SHA-256: 012fcdee5f6213e5980f082cb8366e94638c7b1f764145c9eac79702412d2a97
font_01_sfnt_off000082d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D2 4084 bytes
SHA-256: df85173feea72dc2f2189124c35b140faf44ef7a36f3496b492965e474480a3b
font_02_sfnt_off00009091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9091 18044 bytes
SHA-256: bd14df214c2131ecafde850c89131197571c349499ee254458e05dff40e3b762

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